We don't watch enough films to make a monthly subscription worthwhile so we just rent them one at a time from Blinkbox or Google Play. More like the video shop idea of years gone by but you don't need to remember to take them back

NowTV from Sky?
I'm just about to stop my subscription. That is because I have watched the films I want to see ATM. I will probably swap back to Netflix, or use Google Play rentals for a while until the catalogue is full of new stuff.

If you're downloading a legit copy of Popcorn Time, what would be the issue?

The legit version of a tool that connects you to non legit copies of films provided by random people who you can't trace. Sounds very secure Same risk as downloading from other sites really. Once you step away from the above board methods of viewing stuff there are risks.